Simmons Arboretum is a 10-acre (40,000 m2) arboretum in Madison, Mississippi, USA. It is city-owned, a work in progress, and open to the public. It is located at the eastern end of St. Augustine Drive south of the road at .
The Arboretum was created from land donated to the city by Dr. and Mrs. Walter Simmons, and has evolved from unimproved land to a nature walk. Nearly a mile (1.6 km) of walking trails now exist, and plants have been identified and cataloged. Ongoing plans include further design, planting, and labeling of the species.